Extensions of Operators Leaving the Spectrum Invariant
✍ Scribed by M. Jung
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 508 KB
- Volume
- 187
- Category
- Article
- ISSN
- 0022-247X
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## Abstract A general construction for the Friedrichs extension of symmetric semi‐bounded block operators with not necessarily bounded entries, acting in the product of Hilbert spaces has been given by Konstantinov and Mennicken via the form There the entry __A__ was assumed to be essentially sel
We study completions of diagrams of extensions of C\*-algebras of the form 0 wwÄ v wwÄ v wwÄ v wwÄ 0 0 wwÄ v wwÄ v wwÄ v wwÄ 0 in which all three C\*-algebras in one of the rows and either the ideal or the quotient in the other are given, along with the three morphisms between them. We find universa